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104 lines
4.0 KiB
C
104 lines
4.0 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* The new form of this macro (check if the a*b == 0) was suggested by Colin
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* Plumb <colin@nyx10.cs.du.edu>
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*/
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/* Removal of the inner if from from Wei Dai 24/4/96 */
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#define idea_mul(r,a,b,ul) \
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ul=(unsigned long)a*b; \
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if (ul != 0) \
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{ \
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r=(ul&0xffff)-(ul>>16); \
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r-=((r)>>16); \
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} \
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else \
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r=(-(int)a-b+1); /* assuming a or b is 0 and in range */
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/*
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* 7/12/95 - Many thanks to Rhys Weatherley <rweather@us.oracle.com> for
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* pointing out that I was assuming little endian byte order for all
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* quantities what idea actually used bigendian. No where in the spec does
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* it mention this, it is all in terms of 16 bit numbers and even the example
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* does not use byte streams for the input example :-(. If you byte swap each
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* pair of input, keys and iv, the functions would produce the output as the
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* old version :-(.
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*/
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/* NOTE - c is not incremented as per n2l */
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#define n2ln(c,l1,l2,n) { \
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c+=n; \
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l1=l2=0; \
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switch (n) { \
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case 8: l2 =((unsigned long)(*(--(c)))) ; \
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case 7: l2|=((unsigned long)(*(--(c))))<< 8; \
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case 6: l2|=((unsigned long)(*(--(c))))<<16; \
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case 5: l2|=((unsigned long)(*(--(c))))<<24; \
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case 4: l1 =((unsigned long)(*(--(c)))) ; \
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case 3: l1|=((unsigned long)(*(--(c))))<< 8; \
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case 2: l1|=((unsigned long)(*(--(c))))<<16; \
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case 1: l1|=((unsigned long)(*(--(c))))<<24; \
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} \
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}
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/* NOTE - c is not incremented as per l2n */
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#define l2nn(l1,l2,c,n) { \
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c+=n; \
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switch (n) { \
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case 8: *(--(c))=(unsigned char)(((l2) )&0xff); \
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case 7: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \
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case 6: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \
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case 5: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \
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case 4: *(--(c))=(unsigned char)(((l1) )&0xff); \
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case 3: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \
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case 2: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \
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case 1: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \
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} \
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}
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#undef n2l
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#define n2l(c,l) (l =((unsigned long)(*((c)++)))<<24L, \
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l|=((unsigned long)(*((c)++)))<<16L, \
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l|=((unsigned long)(*((c)++)))<< 8L, \
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l|=((unsigned long)(*((c)++))))
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#undef l2n
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#define l2n(l,c) (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
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*((c)++)=(unsigned char)(((l)>>16L)&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
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*((c)++)=(unsigned char)(((l) )&0xff))
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#undef s2n
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#define s2n(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8L)&0xff))
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#undef n2s
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#define n2s(c,l) (l =((IDEA_INT)(*((c)++)))<< 8L, \
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l|=((IDEA_INT)(*((c)++))) )
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#define E_IDEA(num) \
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x1&=0xffff; \
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idea_mul(x1,x1,*p,ul); p++; \
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x2+= *(p++); \
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x3+= *(p++); \
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x4&=0xffff; \
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idea_mul(x4,x4,*p,ul); p++; \
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t0=(x1^x3)&0xffff; \
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idea_mul(t0,t0,*p,ul); p++; \
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t1=(t0+(x2^x4))&0xffff; \
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idea_mul(t1,t1,*p,ul); p++; \
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t0+=t1; \
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x1^=t1; \
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x4^=t0; \
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ul=x2^t0; /* do the swap to x3 */ \
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x2=x3^t1; \
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x3=ul;
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